lt3484-1 Linear Technology Corporation, lt3484-1 Datasheet
lt3484-1
Related parts for lt3484-1
lt3484-1 Summary of contents
Page 1
... Fast Photoflash Charge Times: 4.6s for LT3484-0 (0V to 320V, 100µF, V 5.7s for LT3484-2 (0V to 320V, 100µF, V 5.5s for LT3484-1 (0V to 320V, 50µF, V ■ Operates from Two AA Batteries, or Any Supply from 1. 16V ■ Controlled Average Input Current ...
Page 2
... 3V, unless otherwise noted BAT CHARGE CONDITIONS Not Switching CHARGE LT3484-0 LT3484-2 LT3484-1 LT3484- LT3484- 650mA SW LT3484- 400mA SW Measured as V – 300ns Pulse Width Measured as V – CHARGE CHARGE 5V, in Shutdown IN SW 100kΩ ...
Page 3
... W U TYPICAL PERFOR A CE CHARACTERISTICS LT3484-1 curves use the circuit of Figure 7 and LT3484-2 use the circuit of Figure 8, T LT3484-0 Charging Waveform 100µF OUT V OUT 50V/DIV AVERAGE INPUT CURRENT 1A/DIV 1s/DIV 3484 G01 LT3484-0 Charge Time 100µF ...
Page 4
... LT3484-0/LT3484-1/LT3484 TYPICAL PERFOR A CE CHARACTERISTICS LT3484-1 curves use the circuit of Figure 7 and LT3484-2 use the circuit of Figure 8, T LT3484-0 Switch Current Limit 1.5 1.4 1.3 1.2 1.1 – 40 – 100 TEMPERATURE (°C) 3484 G10 LT3484-0 Input Current 800 ...
Page 5
... W U TYPICAL PERFOR A CE CHARACTERISTICS LT3484-1 curves use the circuit of Figure 7 and LT3484-2 use the circuit of Figure 8, T LT3484-0 Switching Waveform 100V OUT V SW 10V/DIV I PRI 1A/DIV 1µs/DIV 3484 G19 LT3484-0 Switching Waveform 300V OUT V SW 10V/DIV I PRI 1A/DIV 1µ ...
Page 6
... SHOT LT3484- 0.015Ω SENSE LT3484- 0.022Ω SENSE LT3484- 0.03Ω SENSE 6 PC Board. Minimize the metal trace area connected to these pins to minimize EMI. Tie one side of the primary of the transformer to these pins. The target output voltage is set by the turns ratio of the transformer. ...
Page 7
... Due to the lower peak current, the LT3484-1 can use a physi- cally smaller transformer. The LT3484-2 has a current limit in between that of the LT3484-0 and the LT3484-1. ...
Page 8
... This will adversely affect the charge time of the photoflash circuit. Linear Technology has worked with several leading mag- netic component manufacturers to produce pre-designed flyback transformers for use with the LT3484-0/ LT3484-1/LT3484-2. Table 2 shows the details of several of these transformers. TYPICAL RANGE LT3484-0 >5 ...
Page 9
... PK SEC For the circuit of Figure 6 with V and I PK-SEC recommended for most LT3484-0/LT3484-1/LT3484-2 applications. Another option is to use the BAV23S dual silicon diodes. Table 3 shows the various diodes and relevant specifications. Use the appropriate number of diodes to achieve the necessary reverse breakdown voltage. “ ...
Page 10
... MMBD3004S 2x350 (Dual Diode) Board Layout The high voltage operation of the LT3484-0/LT3484-1/ LT3484-2 demands careful attention to board layout. You will not get advertised performance with careless layout. Figure 5 shows the recommended component placement. Keep the area for the high voltage end of the secondary as small as possible ...
Page 11
... RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. LT3484-0/LT3484-1/LT3484-2 T1 1:10.2 V BAT 1 ...
Page 12
... DONE DONE 1 CHARGE CHARGE 2 C1: 4.7µF, X5R OR X7R, 10V T1: TDK PART# LDT565630T-001, L D1: VISHAY GSD2004S DUAL DIODE CONNECTED IN SERIES R1: PULL UP RESISTOR NEEDED IF DONE PIN USED LT3484-1 Photoflash Circuit Uses Tiny 3mm Tall Transformer V BAT 1. 4.7µ BAT ...